c# - SQLite.Net-PCL terrible performance (InsertOrReplace)

foreach (var tour in Tours)

            {
 await DbInstance.InsertOrReplaceAsync(tour.Guide);
 await
            DbInstance.InsertOrReplaceAsync(tour.Client);


            }

This block takes 6
seconds to execute !?

I have only 10 tours in
Tours list and database schema is really simple. What is the problem
here?

EDIT
(SOLUTION):

In order to speed it
up, wrap the multiple transactions like
this:

await
            DbInstance.RunInTransactionAsync(connection =>
 {


            **YOUR FOR LOOP**
 //example

            connection.InsertAsync(tour.Guide);

            });